A study of the influence of crystal component on the reactivity of low-calcium fly ash in alkaline conditions based on SEM-EDS

Wang, Tiao1; Ishida, Tetsuya1; Gu, Rui2

2020

10.1016/j.conbuildmat.2020.118227

CONSTRUCTION AND BUILDING MATERIALS   影响因子和分区

0950-0618

1879-0526

The use of fly ash to improve concrete performance has increased around the world in recent decades. However, the engineering application of fly ash remains limited by its heterogeneity and variability. This paper presents a developed approach for comprehensive characterisation of fly ash material properties based on scanning electron microscopy–energy-dispersive X-ray spectroscopy full-element mapping with image analysis. The chemical compositions, mineralogical and amorphous phase assemblage and specific surface area of each phase can be visually analysed and quantified. Analysis reveals that the phase assemblage of fly ash is affected by its combustion conditions. Although a wide distribution of crystalline mullite can be found in fly ash particles, crystalline quartz is usually covered by amorphous silicate. The characterisation approach developed in this study is used to investigate the influence of crystal components on kinetic properties of various phases of fly ash in alkaline conditions. The results show that crystalline mullite affects the kinetic properties of Al-silicate glass and glass-mullite intermixtures.
© 2020 Elsevier Ltd

Reactivity Fly ash SEM-EDS Image analysis Crystal component

EI ; SCI

英语

其他

Japan Society for the Promotion of Science[17H01284]

Construction & Building Technology ; Engineering ; Materials Science

Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary

WOS:000527409700048

Elsevier Ltd

20200608130312

Alkalinity ; Calcium ; Chemical analysis ; Energy dispersive spectroscopy ; Glass ; Image analysis ; Mullite ; Reactivity (nuclear) ; Scanning electron microscopy

Minerals:482.2 ; Alkaline Earth Metals:549.2 ; Radioactive Materials, General:622.1 ; Chemistry, General:801.1 ; Glass:812.3

MATERIALS SCIENCE

EV Compendex

1.Concrete Laboratory, Department of Civil Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; 113-8656, Japan
2.Materials Characterization and Preparation Center, Southern University of Science and Technology, Shenzhen; 518055, China

Wang, Tiao,Ishida, Tetsuya,Gu, Rui. A study of the influence of crystal component on the reactivity of low-calcium fly ash in alkaline conditions based on SEM-EDS[J]. CONSTRUCTION AND BUILDING MATERIALS,2020,243.

Wang, Tiao,Ishida, Tetsuya,&Gu, Rui.(2020).A study of the influence of crystal component on the reactivity of low-calcium fly ash in alkaline conditions based on SEM-EDS.CONSTRUCTION AND BUILDING MATERIALS,243.

Wang, Tiao,et al."A study of the influence of crystal component on the reactivity of low-calcium fly ash in alkaline conditions based on SEM-EDS".CONSTRUCTION AND BUILDING MATERIALS 243(2020).